Ocular micrometer



Dec. 22, 1925. 1,566,278

` G. A. H. KELLNER Q OCULAR MICROMETER Filed Oct 1925 fi r\ 10.: ii o u INVENTOR.

/zs ATTORNEY Patented Dec. 22, 1925.

=UNITED STATES PATENT OFFICE.

GUSTAV A. H. KELLNER, OF ROCHESTER, NEW YORK, ASSIGNOB TO BAUSCH &E LOMB OPTICAL CO., OF ROCHESTER, NEW YORK, A CORPORATION OF NEW YORK.

OCULAE MICROMETER.

Application filed October 9, 1923.

T 0 all 'whom it may COIUWZJ Be it known that I, GUSTAV A. H. KELL- NER, a citizen of the United States, residing at Rochester, in the County of Monroe and State ot New York, have inventod certain new and useful Improvements in Ocuhr Mierometers; and I do hereby leclare the following to be a full, clear, anal exact description ol the same reference being had to the accompanying drawings, forming a part of this specification, and to the referenee numerals marked thereon.

This nvention relatee to measuring instruments and more particularly to the variety known as ocular micronietere having tor its object the provision of a iple and efiicient instrument of this character eapable of being adjusted and read rapdly, eonveniently and with aeeuraey, and at the same time having a Construction which may be produced at a relatively low cost.

To these and other ends the invention resides in certain improvements and combinations of parts all as Will be hereinafter more fully described, the novel features being pointed out in the claims at the end of the specification.

In the drawing:

Fig. 1 is a perspeetive View of an ocular micrometer embodying the present invention together with a seale to be read thereby.

Fig. 2 is an enlarged View of the operating parts with the casing removed, showing the same in initial position for taking a reading on the scale and Fig. 3 is a similar View showing the parts as finally adjusted to give the complete reading.

Similar reference numerals throughout the several Views indicate the same parts.

In the embodiment of the invention herein disclosed by way of illustration of the principles involved, there is employed :i suitable optieal system for forming an image of the scale to be read. or other part to be observed such, for example, as commonly used in reading micrometers or telescopes. This optical system is contained within a tube 5, Fig. l, having an eyepieee 8, and being of well known Construction, requires no further description. Tube 5 is provided with a box or easing G within which the micrometer means is housed and in the plane of which the image of the scale 7 is formed. At 9 are finger pieces fixed on Serial No. 667,&92.

the outer ends ot rods 10 and ll for adjustin the micrometer means, as more particularly neserbod hereater. The Casing G is shown in the present instance as genci-:Lily circular in shape, but it is to bo niderstooh oil' course, that the casing may have any suitable term adapted to particular applications of 'the invention and the casing and tube may be supported in any suitable known manner for reading the seale or other part to be observed, as well understood in the art.

The ini 'onieter measuring ieans 'or subdividin the graduztions of the scale to be read compriees, preterably, a Subdividing scale and coope ing index adjustable vith re' r nce to the image of the scale to be r' 'or subtlividing the gradnations there i and an advantageous wedge means tor quickly and accurately making such adjustments. lteferring more particularly to l `igf9, there is represented at 12 the image of the scale to be read formed within the easing by the optical means. At 13 in the plane of the image is a plate of glass or other transparent material provided at l l with one or more index lines extending` parallel with the graduations of the scale image for adjustment longitndinally of the latter into registry with the graduations by movement of the plate as hereafter deseribed. At 15, preferably in continuation of the index 14 and at one side of the scale image is a subdividing scale graduated to aflord the desired subdivision of the nnits of the scale to be rea-il. The plate or :neniber 13 is prel erably fixed as; by means of screws 16 on a wedge part 17. The latter has an inclined lower edge retained by any suitable means in sliding engagement with the inclined npper edge of a stationary wedge part 18 fixed in any suitable manner in casing (E. .lt is zn parent 'l roni this construction that by sliding the movable 'wedge part 17 on the stationary part 18 plate l given an oblique movement having both a vertical and a horizontal Component. The vertical Component of this movement serves for adjusting index over the scale image for reading the same, while the horizont l Component shifts the subdividing seaie relative te a fixed index line 19 preferably marked on a strip of glass or other transparent material 20 project-ing upwardly from stationary support, in the present instanoe the Wedge part 18. The adjusting rods 10 and ll tleserihee above are fixed to the ends of the movable Wedge part 17 end extend throiigh openings in the casing` G as shown.

The image ot the scaie to be read, the subdividing scale 15 and the ind'ees l l; and 19 lie substantially in a connnon plane. The length nit the suhdiridingg smile 15 is s ch that adjustnient of the niovahle wedge tor the :full `ength o'' this a-ale prodnees a, Jno'x 'en'ent of index ,ti over one ot the unit divisiorn oi the e e to he read. Preferahly intzex ti: cens ot' two adjaeent pae-aiiei iines :na show& which hare heen 'ton 'i convenient tor obtaining; a quick and awurate setting.

It is apparent 'froni the above description that the niovahle wedge may he adjnsted by means of linger pieces 9 to bring the zero ot' the suhdividing scale into registry with the coope 'ating index 19 as shown in Fig Index l l will then usually he tound to lie above one oi? the graduation marks ot the image of the scale to he read. The inovable wedge is then adjusted toward the left and the index mark l l therehy lowered until it coineides with the. next low graduation ot the main scale, as shown in Fi 23. tueh adjustinent moves the subdividin' srale i' so that its .index i?) indicates en this & c-ah the reading 'for the Suhdivisien. 'Thiis as shown in the drawing the nain seale reznlim is 9.7 and the suldivision reading 0.06 se that the complete "reading is 9.76. The reading may ot course, he carried to :further decinial places by further suhdivision of the Scales. There :is thus provided a construction ot a relzrtively simple character coingrising hu'; few parts which may he readily mnnfactured at a comperntively low cost as no great precision in manufactnring methods is required. ?he wedge adjusting means is quickly and With a high degree of aeenracy, and the complete reading nay he niade :it once wi h one position ot eye. There is no superposing of scales in some types of instruments in common use, the indicia being so arranged and ot such a character as to be easily and quickly rend.

I claim as my invention:

l. In an ocular micrometer, the combinetion with optical means forming an image of a seale to be read, of wedge parte movable one on the other, one of said parts having an i mari: and the other a cooperating sul)- dividing scaie, and an index mark on the movable one of said parts adjustable over the image of the seale to he read.

2. In an oenlar mierometer, the combinetion with optical means forming an image 0:6 a seale to he read, of a moyahle meniher having an indet-1 for registry with the graduations of said scale image, n fixed member, one of said members having a suhdividing scale and the other a cooperating index, and wedge parts slidable linearly one upon another tor moving said mo 'able meniher.

3. In. an oeuhr micrometer, the conhination with a casing and optical means torining in. said cnsing an image oil? the sczle 'lo 'oe read oti? a wedge part 'ixed in said casing, a wedge part slidahle on said 'ixed part, one ot said paris having an iin, `-x mark and the other a cooperating sul n lividing smile, and an index mark on said slidahle wedre part adjnratahle into regitry with the image ot the ;rraduations ot thi` sente to he read tor iii-lir tiiir Huhdivinions thereo't on said sul diridin seale.

i. in an eenlar n'iieronieter, the eonihina- 'tion with opt cal meam; forming an image of &sale to read, ot a fixed wedge pa rt, a iart slidahle linearly on said fixed index mart.: an said fixed part, a .ing smile on said slidable part -o- Hilitl sl :i niicronicter, the conhina- 'ilh opical means forining :i image oi' i ht'llt* to te renda of a plate of transparent ieriai n rted with an index 'tor 'o 'era,- n with the gradnitions ot said scaie ini- 1 i also with a suhdividinr scalm a fixed .ex rooperzzting with said suhdividin' seale and wed e parts slidable linearly one upon another tor moving said plate.

(i. ln an ocular micrometer the combination with, t casing and optical means torining in said casing an image ot the scale to he read, ot' a glass plate in said casing inovahle snhstantially in the plane of said image and marked with an .index eoo erating with the gradnations of said seale image and also with a suhdividing scale, a fixed meniher in said :asing having an index C()()l)-UI':'til with said subdividing scale substantially in said plane, and wedge parts adapted to slide one upon another for moi 'ing said plate.

'7. ln an ocular micronieter, the eoinhination with a casing and optical means torining in said casing` an image ot the scaie to he read of a Wedge part nxed in said casing, a wedge part slidahle on said fixed part, a glass plate on said slidable part marked with an index ceoperating with the graduat-ions ot said seale image and with a sul)- diwiding seaie, a member on said fixed part marked 'ith an index cooperating with said subdiriding scale, and nanually operahle means outside said casing 'tor adjnsting said slidahle wedge part.

GUSTAV A. H. KELLNER. 

